Figure 264. I 2 S Philips Protocol Waveforms (16/32-Bit Full Accuracy, Cpol = 0); Figure 265. I 2 S Philips Standard Waveforms (24-Bit Frame With Cpol = 0); Figure 266. Transmitting 0X8Eaa33 - ST STM32F405 Reference Manual

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Serial peripheral interface (SPI)

Figure 264. I

Data are latched on the falling edge of CK (for the transmitter) and are read on the rising

edge (for the receiver). The WS signal is also latched on the falling edge of CK.

Figure 265. I

This mode needs two write or read operations to/from the SPI_DR.

In transmission mode:

if 0x8EAA33 has to be sent (24-bit):

In reception mode:

if data 0x8EAA33 is received:

S Philips protocol waveforms (16/32-bit full accuracy, CPOL = 0)

transmission

S Philips standard waveforms (24-bit frame with CPOL = 0)

Transmission

Channel left 32-bit

First write to Data register

RM0090 Rev 18

Can be 16-bit or 32-bit

Channel left

8-bit remaining 0 forced

Second write to Data register

Only the 8 MSB are sent

to compare the 24 bits

8 LSBs have no meaning

and can be anything

Channel right

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